Kudos for being the only post on this forum that actually listed the P/N.So yes, you have the wrong part.
Looks like PN for aux input with RSE (Rear Seat Entertainment) is 30790263 for chassis<569911 (last 6 of VIN) and 31324131 for chassis>569912. Since you're an '08, it's probably going to be the xx63 PN. Try an internet search for this PN (specifically images) and you'll see what it looks like (just like your green one).
PN 30657961 is for vehicles with no RSE.